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  • Recent Forum Posts

    pedja089

    Re: Calculate tuning value for the AD9850 DDS.

    Here it is. It wasn't tested...

    ftw var long ; unsigned long ftw; // 32-bit Frequency Tuning Word
    f var long

    ;/************************************************************************
    ;...

    pedja089 Yesterday, 23:33 Go to last post
    richard

    Re: Confused by Arraywrite

    mikes quote here is very wrong



    from the manual



    the inflexible way

    richard Yesterday, 23:15 Go to last post
    pedja089

    Re: Multiplexer address control..

    for control = 0 to 15
    LATB.4=Control.0
    LATB.5=Control.1
    LATB.6=Control.2
    LATB.7=Control.3
    next control

    pedja089 Yesterday, 22:20 Go to last post
    retepsnikrep

    Re: Multiplexer address control..

    Yes thanks, but how to step through the options in the most efficient way without disturbing ports B0-3

    retepsnikrep Yesterday, 21:26 Go to last post
    Mike, K8LH

    Re: Calculate tuning value for the AD9850 DDS.

    Yes, in XC8 that's how you would address the "local" variables (c, f, and n) using assembly language.

    Mike, K8LH Yesterday, 21:10 Go to last post
    mpgmike

    Re: Confused by Arraywrite

    The ARRAYWRITE command prepends the LOOKUP or LOOKDOWN commands.



    b0 VAR BYTE
    b1 VAR BYTE
    Letter VAR BYTE[9]
    ARRAYWRITE Letter, ["SOMETHING"]
    FOR b0 = 0 TO 8
    LOOKUP b0, [Letter], b1

    mpgmike Yesterday, 18:14 Go to last post
    retepsnikrep

    Confused by Arraywrite

    I've looked at the examples and posts on here and they are helpful but.....

    OK I have a 38x25 display.
    I can talk to it using hserout and have a 1ms interrupt running so want to send it 1...

    retepsnikrep Yesterday, 15:52 Go to last post
    pedja089

    Re: Calculate tuning value for the AD9850 DDS.

    Mike,
    It can be almost copy/paste in PBP. I can try to sort details to work in PBP. But I don't understand what is calcFTW@c,@f,@n... Is it just variables declared in function?
    Can you explain?

    pedja089 Yesterday, 09:12 Go to last post
    pedja089

    Re: Multiplexer address control..

    If you are using PIC 18F, then use simplest solution is
    LATB.4=Control.0
    LATB.5=Control.1
    LATB.6=Control.2
    LATB.7=Control.3

    EDIT:
    For PIC16

    PortBCopy var byte

    pedja089 Yesterday, 09:01 Go to last post
    retepsnikrep

    Multiplexer address control..

    I have a HTC4067 16x1 multiplexer, it's controlled by four lines S0, S1, S2, S3
    I have these all connected to Port B pins 4,5,6,7 respectively on my pic. This could be reversed to 7,6,5,4 if that...

    retepsnikrep Yesterday, 08:24 Go to last post

  • How To RSS Feed

    Microchip Tips and Tricks 

    by
    ScaleRobotics
    • View Profile
    • View Forum Posts
    • View Articles
    Published on - 17th June 2010 17:26  Number of Views: 6653 

    The link below has the most information about tips and tricks using PIC micro-controllers. The attachment is a smaller version ...
    Read More Read More

    Presetting Configuration Fuses (PIC Defines) into your Program 

    by
    Melanie
    • View Profile
    • View Forum Posts
    • View Articles
    Published on - 20th May 2010 16:27  Number of Views: 6320 

    1. What are the Configuration Fuses?
    2. How can I preset them in my Program?
    2.a. When using MeLabs default     ...
    Read More Read More

    Bits, Bytes Words and Arrays 

    by
    Melanie
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    • View Forum Posts
    • View Articles
    Published on - 23rd April 2010 19:39  Number of Views: 2855 

    1. How can I reference a BIT in a BYTE?
    2. How can I reference a BIT in a WORD?
    3. How can I reference a BIT in a BYTE ARRAY?
    4. How can I reference a BIT in a WORD ARRAY?
    5. How can I reference a BYTE in a WORD ARRAY?
    ...
    Read More Read More

    I’m Running Out of CodeSpace, What Can I Do? 

    by
    Melanie
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    • View Articles
    Published on - 23rd April 2010 19:28  Number of Views: 5953 

    I’m Running Out of CodeSpace, What can I do?
    My progam is too slow - What can I do?

    Apart from the obvious and move to a faster PIC with more program memory, there’s a few little known tricks you can try.
    ...
    Read More Read More
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